メタデータ
| 項目 |
値 |
| Designation |
C/2002 P1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-11-23T03:57:52.277760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:18Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2002-10-24.0000000 |
| e |
0.98421998 |
| q (au) |
6.530244 |
| a (au) |
413.829798 |
| i (deg) |
34.606111 |
| Ω (om, deg) |
310.672601 |
| ω (w, deg) |
347.764743 |
| M (ma, deg) |
0.039201 |
等級
散乱 + 全体線形
$$
M_a = (14.523 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.523 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.776 |
| k |
0.800 |
| δ90 |
9.989 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
04:41:43.96 |
+51:07:02.0 |
HIP 21754 |
14.02 |
| 2026-03-26 12:00 |
04:41:46.09 |
+51:06:44.1 |
HIP 21754 |
14.34 |
| 2026-03-27 00:00 |
04:41:48.26 |
+51:06:26.3 |
HIP 21754 |
14.68 |
| 2026-03-27 12:00 |
04:41:50.46 |
+51:06:08.6 |
HIP 21754 |
15.03 |
| 2026-03-28 00:00 |
04:41:52.69 |
+51:05:51.1 |
HIP 21754 |
15.39 |
| 2026-03-28 12:00 |
04:41:54.96 |
+51:05:33.6 |
HIP 21754 |
15.76 |
| 2026-03-29 00:00 |
04:41:57.26 |
+51:05:16.3 |
HIP 21754 |
16.14 |
| 2026-03-29 12:00 |
04:41:59.60 |
+51:04:59.1 |
HIP 21754 |
16.53 |
| 2026-03-30 00:00 |
04:42:01.97 |
+51:04:42.1 |
HIP 21754 |
16.93 |
| 2026-03-30 12:00 |
04:42:04.37 |
+51:04:25.1 |
HIP 21754 |
17.33 |
| 2026-03-31 00:00 |
04:42:06.80 |
+51:04:08.3 |
HIP 21754 |
17.75 |
| 2026-03-31 12:00 |
04:42:09.27 |
+51:03:51.6 |
HIP 21754 |
18.17 |
| 2026-04-01 00:00 |
04:42:11.77 |
+51:03:35.0 |
HIP 21754 |
18.60 |
| 2026-04-01 12:00 |
04:42:14.30 |
+51:03:18.6 |
HIP 21754 |
19.04 |
| 2026-04-02 00:00 |
04:42:16.86 |
+51:03:02.3 |
HIP 21754 |
19.48 |
| 2026-04-02 12:00 |
04:42:19.46 |
+51:02:46.1 |
HIP 21754 |
19.93 |
| 2026-04-03 00:00 |
04:42:22.08 |
+51:02:30.0 |
HIP 21754 |
20.39 |
| 2026-04-03 12:00 |
04:42:24.74 |
+51:02:14.1 |
HIP 21754 |
20.85 |
| 2026-04-04 00:00 |
04:42:27.43 |
+51:01:58.3 |
HIP 21754 |
21.32 |
| 2026-04-04 12:00 |
04:42:30.15 |
+51:01:42.6 |
HIP 21754 |
21.79 |
| 2026-04-05 00:00 |
04:42:32.90 |
+51:01:27.1 |
HIP 21754 |
22.27 |
| 2026-04-05 12:00 |
04:42:35.68 |
+51:01:11.7 |
HIP 21754 |
22.76 |
| 2026-04-06 00:00 |
04:42:38.50 |
+51:00:56.4 |
HIP 21754 |
23.25 |
| 2026-04-06 12:00 |
04:42:41.34 |
+51:00:41.3 |
HIP 21754 |
23.74 |
| 2026-04-07 00:00 |
04:42:44.21 |
+51:00:26.2 |
HIP 21754 |
24.24 |
| 2026-04-07 12:00 |
04:42:47.11 |
+51:00:11.4 |
HIP 21754 |
24.75 |
| 2026-04-08 00:00 |
04:42:50.05 |
+50:59:56.6 |
HIP 21754 |
25.25 |
| 2026-04-08 12:00 |
04:42:53.01 |
+50:59:42.0 |
HIP 21754 |
25.77 |
| 2026-04-09 00:00 |
04:42:56.00 |
+50:59:27.6 |
HIP 21754 |
26.29 |
| 2026-04-09 12:00 |
04:42:59.02 |
+50:59:13.3 |
HIP 21754 |
26.81 |
| 2026-04-10 00:00 |
04:43:02.07 |
+50:58:59.1 |
HIP 21754 |
27.34 |
| 2026-04-10 12:00 |
04:43:05.15 |
+50:58:45.0 |
HIP 21754 |
27.87 |
| 2026-04-11 00:00 |
04:43:08.26 |
+50:58:31.1 |
HIP 21754 |
28.40 |
| 2026-04-11 12:00 |
04:43:11.39 |
+50:58:17.4 |
HIP 21754 |
28.94 |
| 2026-04-12 00:00 |
04:43:14.55 |
+50:58:03.8 |
HIP 21754 |
29.48 |
| 2026-04-12 12:00 |
04:43:17.75 |
+50:57:50.3 |
HIP 21754 |
30.03 |
| 2026-04-13 00:00 |
04:43:20.97 |
+50:57:37.0 |
HIP 22193 |
30.28 |
| 2026-04-13 12:00 |
04:43:24.21 |
+50:57:23.8 |
HIP 22193 |
29.85 |
| 2026-04-14 00:00 |
04:43:27.49 |
+50:57:10.7 |
HIP 22193 |
29.42 |
| 2026-04-14 12:00 |
04:43:30.79 |
+50:56:57.8 |
HIP 22193 |
28.99 |
| 2026-04-15 00:00 |
04:43:34.12 |
+50:56:45.1 |
HIP 22193 |
28.55 |
| 2026-04-15 12:00 |
04:43:37.47 |
+50:56:32.5 |
HIP 22193 |
28.12 |
| 2026-04-16 00:00 |
04:43:40.85 |
+50:56:20.0 |
HIP 22193 |
27.69 |